Channel Port - Ebyte NB144ES User Manual

Table of Contents

Chengdu Ebyte Electronic Technology Co., Ltd.

}

server address: ProductKey . iot-as-mqtt.cn-shanghai.aliyuncs.com:1883

pic for subscription and publishing : /a1GlhuTU1yN/DEV04/user/1234

Cloud MQTT platform communication test:

4.5 Channel port

random port:

TCP client, UDP client, HTTP client, MQTT client can configure the local port as 0 (use random local port),

server mode cannot use random port, otherwise the client cannot establish the connection correctly (device is not

correctly configured) port listening).

Using a random port connection can quickly re-establish the connection when the device is accidentally

disconnected from the server, preventing the server from rejecting the connection due to four waved incomplete. It

is recommended to use a random port in client mode.

When the device configures the TCP client, HTTP client, and MQTT client mode at AT , it will automatically

configure a random port, which can be canceled by customization.

Static port:

Device fixed port (factory default: 8 001-800 4 ), TCP server mode device listens to the configuration port,

accepts the connection request from the client and establishes a connection for data communication, and TCP client

mode device fixed port initiates a connection request.

NB144ES User Manual

Table of Contents